R help - Apr 2009 - Subset a data frame for plotting

Hello,

   I have a question regarding how to subset/select parts of a data  
frame (matrix) in order to plot data associated only with this subset.  
Specifically I have a large data frame in which one column contains ID  
values (dates), and other columns contain data I would like to plot  
(temperature, light, etc.). I would like to break up this large matrix  
so as to plot data associated with specific ID values (dates)  
separately. I have learned of several commands that supposedly subset  
matrices in this manner and have tried the following code with no  
success:

200706183<-subset(AllData, ID = 200706183)
200706183<-gx.subset(AllData, ID == 200706183)
200706183<-subset(x=AllData, AllData$ID = 200706183)
200706183<-gx.subset(x=AllData, AllData$ID == 200706183)

In using this code my plan was to create smaller data frame objects  
which I could then plot. My first question, though, is whether this is  
the correct approach. Is there a more efficient way I can create plots  
conditional on certain criteria such as "code = 200706183" ?
   If I do need to first create separate smaller data frames, how do I  
go about doing this? Am I missing something in the above commands?
   Any other advice is certainly welcome too, as I admit to being a  
bit new to R. Thank you very much for any answers, tips, suggestions,  
etc.!

Best wishes,
Paul Simonin

-- 
Paul W. Simonin
Graduate Research Assistant, MS Program
Vermont Cooperative Fish and Wildlife Research Unit
The Rubenstein School of Environment and Natural Resources
University of Vermont
81 Carrigan Dr.
Burlington, VT 05405
Ph:802-656-3153

I am not sure what you are trying to assign a value to '200706183<-';
does not look like a valid object name.  This should work:

x200706183<-subset(AllData, ID == 200706183)

Notice the use of the '==' for the logical compare.

On Thu, Apr 9, 2009 at 8:58 PM, Paul Warren Simonin
<Paul.Simonin at uvm.edu> wrote:
> Hello,
>
> ?I have a question regarding how to subset/select parts of a data frame
> (matrix) in order to plot data associated only with this subset.
> Specifically I have a large data frame in which one column contains ID
> values (dates), and other columns contain data I would like to plot
> (temperature, light, etc.). I would like to break up this large matrix so
as
> to plot data associated with specific ID values (dates) separately. I have
> learned of several commands that supposedly subset matrices in this manner
> and have tried the following code with no success:
>
> 200706183<-subset(AllData, ID = 200706183)
> 200706183<-gx.subset(AllData, ID == 200706183)
> 200706183<-subset(x=AllData, AllData$ID = 200706183)
> 200706183<-gx.subset(x=AllData, AllData$ID == 200706183)
>
> In using this code my plan was to create smaller data frame objects which I
> could then plot. My first question, though, is whether this is the correct
> approach. Is there a more efficient way I can create plots conditional on
> certain criteria such as "code = 200706183" ?
> ?If I do need to first create separate smaller data frames, how do I go
> about doing this? Am I missing something in the above commands?
> ?Any other advice is certainly welcome too, as I admit to being a bit new
to
> R. Thank you very much for any answers, tips, suggestions, etc.!
>
> Best wishes,
> Paul Simonin
>
> --
> Paul W. Simonin
> Graduate Research Assistant, MS Program
> Vermont Cooperative Fish and Wildlife Research Unit
> The Rubenstein School of Environment and Natural Resources
> University of Vermont
> 81 Carrigan Dr.
> Burlington, VT 05405
> Ph:802-656-3153
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?